The problem with the pests we are dealing with is we need a solution that is strong enough to kill them quickly and completly, or knock them off.....without killing the coral.
Unfortunatly, SPS are pretty sensitive to begin with.....top that off with cutting a piece off, throwing it in a bag of non circulating water....etc,etc,etc....and your going to have some stress....and this is on top of whatever stress perhaps already existed.
This is another reason QT is still recommended first, then dipping only if found to be needed. However, we might not be able to hold a frag(s) long term in isolation, so many of us are forced to dip imediatly along with heavy inspection.
Dipping is an art.....In the end you have to remind yourself that loosing frags this way, is much better than loosing your whole tank should you not.
I have lost more pieces in the dipping process than I would like to think about, but keep the big picture in mind.....
This is why SPS keepers are crazy....we get kicked in the face....and then go and do it over and over and over......